fa شاخص‌های اکوستیکی در بیماران فارسی زبان مبتلا به گرفتگی صدا گفتاردرمانی Speech Therapy پژوهشي Research <div style="text-align: justify;"><span style="font-family:times new roman;"><strong>Background & Objectives:</strong> Studying voice acoustic parameters in vowel production is a crucial component of every standard voice evaluation. Voice Analysis is non-invasive. Nowadays, computerized Voice Analysis is growing rapidly. Therefore, understanding acoustic parameters in healthy and unhealthy individuals is more significant than before. This research is a step toward boosting our knowledge about voice acoustic parameters. The main purpose of this research is to study acoustic characteristics in dysphonic and healthy Iranian individuals.&nbsp;<br> <strong>Methods:</strong> The current study was descriptive-analytic. Vowel Analysis was conducted through Praat software. Voices of 50 dysphonic patients and 50 healthy participants were evaluated. The acoustic parameters included average, standard deviation, and range of fundamental frequency, jitter, shimmer, the number and degree of voice breaks, and harmonic to noise ratio.<br> <strong>Results:</strong> In all studied acoustic characteristics, patients&rsquo; mean scores were higher than controls&rsquo; mean scores, except for harmonic to noise ratio which was higher in the healthy individuals. Although, the number of voice breaks in healthy male and female population was zero, it was 1.8 in male patients and 4.4 in female patients (P<0.05).<br> jitter and shimmer in patients were dramatically higher (P<0.05) than their amount in healthy controls; moreover, patients&rsquo; fundamental frequency range (male: 54.6&plusmn;59.0, female: 78.6&plusmn;68.4) was extremely broader than individuals with normal voices (male: 9.7&plusmn;4.1, female: 16.2&plusmn;7.3).<br> <strong>Conclusion:</strong> It was clarified that there are considerably significant differences in some acoustic features. These differences may be used as a foundation for diagnosis and intervention in dysphonic patients. This study illustrated that Acoustic Analysis can differentiate healthy individuals from patients. Hence, it can be used as a non-invasive, fast and accurate method.<br> &nbsp;</span></div> Voice acoustic, Fundamental frequency, Voice break, Perturbation. 8 17 http://fdj.iums.ac.ir/browse.php?a_code=A-10-27-12&slc_lang=fa&sid=1 Farhad Torabinenezhad فرهاد ترابی‌نژاد 10031947532846001117 10031947532846001117 No Assistant Professor, Department of Speech & Language Pathology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran استادیار، گروه آموزشی آسیب شناسی گفتار و زبان، دانشکدۀ علوم توانبخشی، دانشگاه علوم پزشکی ایران، تهران، ایران Farzad Izadi فرزاد ایزدی 10031947532846001118 10031947532846001118 No Professor, Department of ENT, Hazrat Rasoul Medical Complex, Iran University of Medical Sciences, Tehran, Iran استاد، گروه آموزشی گوش و حلق و بینی، مجتمع پزشکی حضرت ‌رسول، دانشگاه علوم پزشکی ایران، تهران، ایران Abbas Pourshahbaz عباس پورشهباز apourshahbaz@yahoo.com 10031947532846001119 10031947532846001119 Yes Associate Professor, Department of Clinical Psychology, Social Welfare & Rehabilitation Sciences University, Tehran, Iran دانشیار، گروه روان‌شناسی بالینی، دانشگاه علوم بهزیستی و توانبخشی، تهران، ایران Mahmood Bijankhan محمود بیژن‌خان 10031947532846001120 10031947532846001120 No Professor, Department of Linguistics, University of Tehran, Tehran, Iran استاد، گروه زبان‌شناسی، دانشگاه تهران، تهران، ایران Moharam Eslami محرم اسلامی 10031947532846001121 10031947532846001121 No Associate Professor, Department of Linguistics, University of Zanjan, Zanjan, Iran دانشیار، دانشکدۀ زبان‌شناسی، دانشگاه زنجان، زنجان، ایران Mohammad Rohani محمد روحانی 10031947532846001122 10031947532846001122 No Associate Professor, Department of Neurology, Hazrat Rasoul Medical Complex, Iran University of Medical Sciences, Tehran, Iran دانشیار، گروه نورولوژی، مجتمع پزشکی حضرت‌ رسول، دانشگاه علوم پزشکی ایران، تهران، ایران Mona Ebrahimipor مونا ابراهیمی‌پور 10031947532846001123 10031947532846001123 No Assistant Professor, Department of Speech Therapy, Social Welfare & Rehabilitation Sciences University, Tehran, Iran استادیار، گروه گفتار‌درمانی، دانشگاه علوم بهزیستی و توانبخشی، تهران، ایران